44 results about "Juvenile" patented technology

The utility model relates to the field of breeding equipment, and discloses an octopus larva breeding device which comprises a shell, partition plates are arranged in the shell, limiting assemblies are arranged on the outer walls of the partition plates, adjusting assemblies are arranged between the partition plates, an open groove is formed in the shell, and PVC pipes are arranged at the tops of the partition plates and used for providing a shielding place for octopus larvae. The number, the diameter and the throwing distance of the PVC pipes can be adjusted according to breeding requirements; the adjusting assembly comprises a connecting rod, and one end of the connecting rod is rotationally connected to the bottom of the partition plate. The sleeve moves on the outer wall of the two-way threaded rod and drives the connecting rods on the two sides to move reversely or oppositely, so that the partition plates get close to each other or get away from each other, the effect of adjusting the distance between the partition plates is achieved, the living space of the octopus larva in the vertical direction can be adjusted, and cultivation is completed in cooperation with adjustment of the PVC pipe; meanwhile, the PVC pipes on each layer can be conveniently replaced by increasing the distance between the partition plates, and the convenience of the octopus larva breeding device is improved.

This invention relates to method, in vivo and in vitro for mass production of entomopathogenic nematodes as a biological control agent for laboratory use and small scale field application against agricultural pest. In vivo production has managed to sustain as a cottage industry. In vivo production is likely to continue as small business venture for niche markets. For in vivo production eight Pakistani strains of entomopathogenic nematodes were mass cultured using G. mellaonella larvae at different concentrations and in vitro production were carried out in soya and wheat flour medium. Average in vivo production potential at were 14 x 106 infective juveniles and in vitro production potential ranged up to 50* 10 6 inefective juveniles.

The present application relates to the technical field of fish breeding, particularly to a breeding and screening device for juvenile prochilodus, comprising: supporting legs, a water tank, a supporting plate, hinges, cover plates, handles, a water outlet pipe, a driving assembly and a screening assembly; the water tank is fixedly installed on the supporting legs, the supporting plate is fixedly installed on one side of the water tank, the cover plates are hingedly connected to the top of the water tank through the hinges, the handles are fixedly installed on the cover plates, the water outlet pipe is fixedly installed on the side of the water tank away from the supporting plate, the driving assembly is fixedly installed on the water tank, and the screening assembly is movably installed in the water tank; the present application can prevent the juvenile prochilodus from having stress reaction during breeding and screening, and can avoid the injury of the juvenile prochilodus without transferring the juvenile prochilodus, thereby greatly improving the screening efficiency of the juvenile prochilodus.

The invention discloses an artificial maturity promoting and fry breeding method for Peltella corii, which comprises the steps of cooling temporary rearing, maturity promoting, mating, spawning, hatching, high-density larva breeding, metamorphosis and the like, male snails and female snails are separately bred during maturity promoting, and a breeding scheme is optimized. According to the technical scheme, batch gonad maturation of parent snails according to plans is achieved, and the maturity is good; high-density breeding technologies such as fertilized egg hatching and larva breeding are overcome, a stable and efficient fry production process is established, a large number of high-quality, healthy and regular-specification young snails are provided for the breeding industry, and the provenance basis of the industry is fundamentally guaranteed.

This utility model relates to the field of juvenile acclimatization pond technology, specifically a juvenile acclimatization pond for mandarin fish based on a recirculating aquaculture system. The pond includes a circular body with a fish inlet fixedly connected to the top of its side wall. This fish inlet is connected to the opening pond via a pipe. The advantages of this utility model are: the circular pond structure combined with a central drain outlet at the bottom allows for rapid and directional discharge of pollutants such as uneaten feed and feces, effectively reducing the entry of large particulate pollutants into the recirculating water treatment system and lowering energy consumption. The unique fish inlet design allows mandarin fish juveniles to be automatically transferred from the opening pond to the acclimatization pond via water flow guidance, avoiding mechanical damage and stress caused by manual harvesting and significantly reducing juvenile loss. The annular spray jet design simulates a natural feeding environment through regular water flow stimulation, successfully establishing a conditioned reflex feeding mechanism in the mandarin fish juveniles, increasing the acclimatization success rate to over 85%.

A method for regulating and controlling freshwater pearl mussels to breed hook larvae all year round belongs to the technical field of aquaculture, and comprises the following steps: selecting sexually mature freshwater pearl mussels, spreading the freshwater pearl mussels in a culture container according to the ratio of female to male being (8-12): 1, keeping the water depth to be 8-12 cm, and keeping the water temperature in the culture container to be 13-18 DEG C; the freshwater pearl mussels are fed with powder formed by mixing hyriopsis cumingii powder and cetyl freeze-dried powder once every 3-5 days, the feeding amount accounts for 6%-10% of the weight of the freshwater pearl mussels, the mass ratio of the hyriopsis cumingii powder to the cetyl freeze-dried powder is (5000-10000): 1, the seasonal limitation of breeding the adulterated larvae by the freshwater pearl mussels is broken through by regulating and controlling the water temperature and strengthening nutrition, and the breeding efficiency of the adulterated larvae is improved. According to the method, the freshwater pearl mussels can continuously breed medium larvae all the year round, the clam larvae can be supplied all the year round, a low-temperature drying sterilization method is adopted, germs can be killed, nutrient substances can be reserved to the maximum extent, and absorption and utilization of the freshwater pearl mussels are facilitated; finally, cyclic utilization is achieved, and waste is turned into wealth.

This invention relates to the field of razor clam aquaculture technology and discloses an air flotation sorting device for juvenile razor clam shells. The device includes a sorting box, which is a rectangular box structure with an open top. Side limiting plates are fixedly installed on the inner walls of the left and right sides of the sorting box. A layered screening mechanism is movably installed inside the sorting box corresponding to the inner side of the side limiting plates. The highest point of the side limiting plates is flush with the highest point of the layered screening mechanism after installation. In this invention, the sorting box stores water, and the entire sorting process for juvenile razor clam shells is completed in an aquatic environment, eliminating the problem of dehydration damage. This design aligns with the aquatic survival characteristics of juvenile razor clam shells, significantly improving the survival rate of sorted juvenile razor clam shells. It solves the problems of traditional sorting methods that result in detachment from the water and low survival rates. The device uses microporous ceramic aeration plates to generate fine and uniform microbubbles, which gently agitate the water, creating a gentle flow without hard impacts. This is suitable for thin-shelled juvenile razor clam shells, reducing the breakage rate of juvenile razor clam shells from the source.

This invention provides a method for the artificial breeding of Litopenaeus vannamei, including steps such as scientifically selecting broodstock, optimizing the breeding environment, controlling the breeding process, fertilization, hatching of fertilized eggs, and intensive rearing. During the breeding process, specific photoperiods and staged feeding strategies are employed, with different ratios of formulated feed and nutritional preparations to meet the nutritional needs of the broodstock. After initial rearing, the hatched juvenile shrimp are graded and selected, followed by intensive rearing. During the intensive rearing stage, water quality parameters are adjusted, and necessary trace elements, vitamins, and specific feeds are administered to promote the healthy growth of the juvenile shrimp. This invention, through meticulous management, significantly improves the breeding success rate and larval survival rate of Litopenaeus vannamei, providing an effective breeding strategy for aquaculture.

This invention provides a feed additive for preventing prolapse of juvenile Toad (Bufo gargarizans) in artificial breeding and its preparation method. This invention also provides a wet pellet feed for preventing prolapse of juvenile Toad (Bufo gargarizans) in artificial breeding and its preparation method. This invention further provides the use of the above-mentioned feed additive and / or wet pellet feed in preventing prolapse of juvenile Toad (Bufo gargarizans). This invention also provides a method for preventing prolapse of juvenile Toad (Bufo gargarizans). The method for preventing prolapse of juvenile Toad (Bufo gargarizans) in artificial breeding provided by this invention improves the stress resistance, immunity, and antioxidant capacity of juvenile Toads, thereby improving the overall health of juvenile Toads in artificial breeding and effectively preventing prolapse.

The invention discloses a blue crab larva development model based on environmental factor regulation and control, and the model comprises an environmental factor obtaining module which is used for obtaining water environment parameters of blue crab culture in any culture stage; the environmental factor acquisition module can also acquire water environment characteristics according to the change of the water environment parameters in time and the relationship between the water environment parameters and a water environment threshold value; the environment factor evaluation module takes the water environment features as feature vectors and inputs the feature vectors into an environment factor classification model to obtain an evaluation result of the water environment for blue crab culture; and the blue crab growth visual detection module is used for photographing the blue crab individuals in the water environment and estimating the growth of the blue crab individuals. Whether the water environment is suitable for growth of the blue crabs or not can be known through analysis of the water environment and analysis of the individual growth degree of the blue crabs, and the water environment is correspondingly adjusted according to the evaluation result of the water environment, so that the water environment is more beneficial to growth of the blue crabs in the next breeding stage or the next breeding period, and a blue crab farmer is assisted to make a production decision.

The sea horse larva floating type fishing cage comprises a bottom shell and a push rod, a mounting mechanism and a connecting mechanism are arranged on the bottom shell, a motor is started, the motor drives a rotating shaft and a rolling shell to roll a connecting rope, then the connecting rope drives a floating plate, a limiting shell and a fishing shell to move upwards, and the floating plate is driven by the push rod to move upwards. The motor is started forwards and backwards to drive the fishing shell to adjust the height, the fishing shell is adjusted to be placed in a proper position in a water pool according to needs, then the sea horse larvae are fished and collected through the connecting mechanism, the collected sea horse larvae can be separated from the water surface according to the operation in the reverse direction after fishing is completed, and then the sea horse larvae are taken out through the connecting mechanism. Through the operation, the position of the fishing shell can be quickly, automatically and accurately adjusted to fish the sea horse larvae, the operation steps of workers are reduced, the time and energy of the workers are saved, and the labor intensity is reduced.

The invention discloses a saline-alkaline-tolerant breeding domestication and long-distance transportation method for larvae of kiss bass. The method comprises the following steps: (1) hatching fertilized eggs; (2) breeding in a hatching pond; (3) culturing in an indoor culture pond; (4) gradually desalting and domesticating; (5) carrying out a long-distance transportation simulation test: (5.1) blending a water body; (5.2) starvation and cooling pretreatment before transportation; (5.3) optimizing the bagging density; (5.4) low-temperature oxygenation sealing and transportation; (5.5) buffering the temperature and water quality after landing into the pool; according to the method, the in-transit stress and death risk can be effectively reduced, the long-distance transportation survival rate and field adaptability are improved, technical support is provided for large-scale cultivation and cross-regional supply of the kiss bass in the inland saline-alkali area, and the method has good application prospects and economic value.

The application discloses a breeding device for prochilodus jaru, and relates to the field of fry breeding.The breeding device comprises a sliding rail and a driving unit, and the driving unit moves along the surface of the sliding rail.The breeding device further comprises a rotating wheel which is installed at the bottom of the driving unit, and a transmission rod is fixedly installed at the middle part of the rotating wheel.A transmission inner shaft is threadedly connected with the rotating wheel, and a connecting plate is threadedly connected with the transmission rod at the middle part of one side of the connecting plate.A horizontal moving plate is fixedly installed at the bottom of the connecting plate.Box two drives the horizontal moving plate on the box two to rotate, the transmission inner shaft rotates to engage the rotating wheel to drive the transmission rod to rotate, and the connecting plate which is threadedly connected with the transmission rod drives the horizontal moving plate to translate along the axial direction of the transmission rod.The breeding device for prochilodus jaru blocks light at the top of the box two, so that the prochilodus jaru is not stimulated by light when cleaning fish manure, and the rotating pipe translates along the edge of the bottom of the box two to the middle part of the bottom of the box two, so that all positions at the bottom of the breeding tank can be cleaned, and the cleaning efficiency and the cleaning neatness of the fish manure at the bottom of the breeding tank are improved.

The invention discloses a fish early-stage sex identification method, which comprises the following steps: selecting early-stage larvae of a plurality of target fishes as samples, collecting phenotypic spectrum data, metabonomics data and epigenetic data of the early-stage larvae of each target fish, and obtaining actual sex labels after the target fishes grow into adult fishes; performing correction and processing to obtain a phenotype spectrum matrix, a standardized metabolism matrix and a methylation matrix; constructing a partial least square objective function of minimizing the regularization with the elastic net, and outputting a spectrum key feature matrix, a metabolism key feature matrix and a methylation key feature matrix; dividing into a training set and a test set; an MLP network model for target fish gender prediction is constructed, training is carried out, and a convergent MLP network model is output; and obtaining a new early larva sample of the target fish, executing the above steps, and determining the gender of the new target fish by using the predicted gender label.

This invention relates to the field of aquaculture technology, and in particular to an immune enhancer for juvenile large yellow croaker (Culter alburnus), its preparation method, and its application. The immune enhancer provided by this invention, through the compounding of specific components in a specific ratio, achieves the synergistic effect of polypeptides, immunopolysaccharides, antioxidants, and nutritional factors, while also considering rapid absorption, immune regulation, and high-temperature environmental stability. It is suitable for the immune enhancement needs of large yellow croaker juveniles under high-temperature seawater conditions of 29-31 °C, and can enhance the non-specific and specific immunity of juveniles under high-temperature seawater conditions, improving disease resistance and survival rate.

To provide a method for capturing and investigating young eel fishes based on the evaluation of the capturing strength of the young eel fishes by which a minute target such as a capturing device for the young eel fishes in a water surface environment can be discriminated from a high spatial resolution remote sensing image.SOLUTION: The method acquires a high spatial resolution remote sensing image covering a survey area and subjected to pre-processing such as geometric correction. The image data of the high spatial resolution remote sensing image is then labeled to establish a high resolution remote sensing image eel fry capture device float sample data set. In addition, in order to improve the target detection algorithm YOLOv8 and avoid missed detection and false detection of small targets, an AFPN with the advantage of small target detection is introduced to replace the original detection head, and a small target detection layer is added. Finally, the improved model is used to identify a device for capturing juvenile eels.SELECTED DRAWING: Figure 10

The utility model relates to a hatching frame for breeding egg-carrying shrimps, and belongs to the technical field of shrimp breeding. Floaters for ensuring that the supporting frame floats in the nursery pond are installed in the middle of the periphery of the supporting frame, isolation nets are installed at the bottom and the periphery of the supporting frame to form an isolation frame with an opening in the top, the isolation nets are breeding isolation nets through which shrimp seeds can pass and female shrimps cannot pass, and the hiding cave is installed on the supporting frame in the isolation frame; the shrimps carrying eggs are independently placed in the isolation frame, and the female shrimps are relatively concentrated, so that observation, management and feeding of the shrimps carrying eggs are facilitated, and fishing after incubation is facilitated; the isolation frame floats in the nursery pond, sundries such as faeces and food residues formed in the breeding process are precipitated to the bottom of the nursery pond through bottom meshes to be discharged, cleanliness in the hatching frame is guaranteed, water quality is guaranteed, a proper living environment is guaranteed, and it is guaranteed that healthy juvenile shrimps are hatched smoothly. Juvenile prawns can enter the nursery pond through the isolation net, female prawns are prevented from eating small prawn seeds, and the breeding efficiency of the prawns and the survival rate of the juvenile prawns can be effectively improved.

The invention in a preferred embodiment comprises a mould (1) for growing a shellfish. The mould has a clip (3) and a substrate (2) and is such that the clip is adapted to hold a shellfish spat so that it is able to grow beyond the clip to become an adult. The substrate (2) has 3-dimensional brand insignia (5) arranged such that when the spat is held by the clip and grows towards adulthood its shell develops against the insignia to produce a 3-dimensional brand in the shell.

The invention relates to the technical field of aquaculture, in particular to a rana nigromaculata early breeding and froglet breeding method and system. On the basis of temperature control and water body stimulation of'fullness, drying and refullness', awakening and delivery are promoted under the condition of no exogenous hormone; a stepped terrain is constructed in the same temperature control greenhouse, the water level and the water-land ratio are adjusted in a linkage mode according to a population metamorphosis rate threshold value, and continuous operation of incubation, cultivation, metamorphosis and food domestication is achieved in cooperation with a water inlet and outlet net bag with the replaceable mesh number, an anti-escape fence and moving / film covering food tables on the two sides. Compared with a conventional pond dividing mode, breeding can be advanced by more than or equal to 2 months, and froglets appear on the market to July; the survival rate of incubation and metamorphosis is improved, drowning is remarkably reduced, the success rate of domestication and the specification uniformity are improved, meanwhile, carrying stress is reduced, and the unit fry cost is reduced.

This invention provides a nutritional additive for improving the survival rate of artificially bred juvenile Toad tadpoles and its preparation method. This invention also provides a compound nutrient solution for improving the survival rate of artificially bred juvenile Toad tadpoles and its preparation method. This invention further provides the use of the above-mentioned nutritional additive and / or compound nutrient solution in improving the survival rate of artificially bred juvenile Toad tadpoles. This invention further provides a method for improving the survival rate of artificially bred juvenile Toad tadpoles. The method provided by this invention for improving the survival rate of artificially bred juvenile Toad tadpoles greatly increases the survival rate of juvenile Toad tadpoles weighing less than 5g, and is simple to operate, has low production costs, and a short growth cycle for the juveniles.

The invention discloses a temperature-controllable hatching device for macrobrachium rosenbergii fry breeding, and relates to the technical field of aquaculture equipment, the temperature-controllable hatching device comprises a bottom plate, the top of the bottom plate is provided with a precise temperature-control circulating hatching mechanism, and one side of the precise temperature-control circulating hatching mechanism is provided with a PLC; according to the temperature-controllable hatching device for macrobrachium rosenbergii fry breeding, by arranging the precise temperature-control circulating hatching mechanism, independent temperature control and water changing of each cavity can be achieved, during water changing, a second electromagnetic valve can independently control a water changing pipe and a water discharging pipe of each cavity, in combination with a pre-warming water body of a constant-temperature water tank, it is ensured that water temperature fluctuation of each cavity is stable in the water changing process, and the hatching efficiency is improved. The problems that an existing hatching device mostly adopts an overall water body heating mode, water temperature distribution is uneven, temperature control response is delayed, the low shrimp egg hatching rate and the poor juvenile shrimp survival rate are easily caused, a traditional device lacks a water body circulation structure, water temperature fluctuation is large during water changing, hatching stability is further affected, and the hatching efficiency is affected are solved. The precise temperature control requirement of large-scale seedling culture is difficult to meet.

The present application relates to the technical field of corrugated lobster breeding, and discloses a method for improving survival rate of planktonic larvae of corrugated lobster. The method divides the larvae density monitoring area according to the physical structure parameters of the breeding pond, continuously collects the initial water environment parameters to obtain the time series data of the water environment, and based on the time series data, adopts the dynamic time axis generation technology to mark the key water quality fluctuation nodes to obtain the water quality change graph with time mark. Combined with the spatial distribution information of the larvae density monitoring area and the water quality change graph, the multi-dimensional environmental factor mapping processing is carried out to generate the larvae survival environment stress matrix. The adaptive learning mechanism is introduced to carry out the pattern recognition processing on the dissolved oxygen fluctuation section and the ammonia nitrogen accumulation point in the stress matrix, and the environmental stress response rule library is established. The rule library is used for dynamically analyzing the breeding equipment operation instructions to generate the feeding path optimization strategy and the oxygenation intensity adjustment strategy.

The invention discloses a preparation method of a feed additive for improving growth performance and intestinal health of larimichthys crocea juveniles, which comprises the following steps: taking dephenolized cottonseed protein with the protein content of 70% as a raw material, and sequentially carrying out step-by-step enzymolysis by using alkaline protease and flavourzyme to obtain the feed additive taking cottonseed peptide as a main component. The obtained feed additive is a functional feed additive capable of improving the digestive enzyme activity of the larimichthys crocea juveniles, enhancing the oxidation resistance and promoting intestinal development, and can effectively improve the growth performance and intestinal health of the larimichthys crocea juveniles.

The utility model provides a juvenile trionyx sinensis screening device, and relates to the technical field of juvenile trionyx sinensis screening, the juvenile trionyx sinensis screening device comprises a middle vibration screening frame, an upper screen frame and a lower water collecting box, the upper portion of the middle vibration screening frame is fixedly connected with the upper screen frame, the lower water collecting box is arranged below the middle vibration screening frame, the two sides of the upper screen frame are fixedly provided with side connection sliding frames, and the side connection sliding frames are connected with the middle vibration screening frame. A first lifting screw is rotatably arranged on the inner side of the side connecting sliding frame and connected with the tail end of the middle baffle in a threaded fit mode, a middle transverse water pipe is rotatably arranged on the front side of the middle baffle in a matched mode through a rotating shaft, and water spraying nozzles are arranged on the front portion of the middle transverse water pipe at intervals in an array mode. The friction force between the juvenile soft-shelled turtles and the upper screen frame and the friction force between the juvenile soft-shelled turtles and the middle vibration screening frame are reduced through the lubricating effect of water flow, the situation that the juvenile soft-shelled turtles are abraded and damaged through screen holes of the upper screen frame is reduced, and the problem that the juvenile soft-shelled turtles are easily damaged due to abrasion with the screen holes of the screen in the screen moving process is solved.

The invention relates to the technical field of Chinese mitten crab seed cultivation, in particular to a method for increasing the survival rate of Chinese mitten crab seed early cultivation, which comprises three key steps of pond design, equipment arrangement and juvenile crab cultivation. Pond structural design is optimized, special breeding equipment is configured, and staged refined breeding management is implemented, so that the growth requirements of the fries are accurately matched with the environment and bait; planting blocks and bait and fertilizer blocks are arranged at intervals in the pond, aquatic plant cultivation and water body pretreatment are matched, the equipment comprises a lamp belt with a bait gathering function and manual and automatic double feeders matched with different breeding stages, and bait types and feeding modes are switched according to the seedling development stage in the breeding process; the method effectively solves the survival adaptation problem of the offspring seeds in the metamorphosis shelling period and the feeding habit conversion period, is suitable for large-scale early-stage cultivation of the eriocheir sinensis offspring seeds, and has good industrial application value and popularization prospects.

The invention provides an artificial breeding method for mackerel squalane fry, namely, on the basis of screening molecular markers related to vibrio resistance characters of squalane squalane, the artificial breeding method for the mackerel squalane fry is established, and the squalane squalane fry with vibrio resistance is cultivated. According to the SNP site molecular marker linked with the blue-point Chimaera anti-vibrio disease character, the SNP site molecular marker is located at the 130 site of the sequence SEQ ID NO: 1, and the basic group of the SNP site molecular marker is C / T. The molecular marker related to the vibrio resistance character of Chimaera blue-dot is obtained through screening and is used for screening disease-resistant parents, so that the disease-resistant genetic breeding speed of Chimaera blue-dot is increased, and the breeding efficiency and the breeding survival rate of disease-resistant strains are improved.

The application discloses a kind of high-efficiency breeding devices of hippocampus young, it is related to aquaculture technical field, including breeding pond, the bottom of one end of breeding pond is fixedly connected with drain pipe, one end of drain pipe is fixedly connected with water circulation mechanism, each two opposite movable block are fixedly provided with support rod, and the sliding connection of barrier net mechanism is achieved between two support rods, the surface of each support rod is slidingly connected with multiple evenly distributed attachment mechanism.The application is slidingly connected with multiple attachment mechanism on support rod, slidingly connected with barrier net mechanism between support rods, the vertical rod connected with first arc piece is provided with a butt joint sleeve, the connecting rope connected with butt joint sleeve is connected with the attachment net including cylindrical surface, through the cooperation of barrier net mechanism and attachment mechanism, it can be guaranteed that hippocampus is evenly attached on each attachment mechanism, it can be guaranteed that hippocampus is evenly distributed in breeding pond, avoid hippocampus gathers too much, guarantee the efficient growth of hippocampus.

The application provides a method for improving the disease resistance of Litopenaeus vannamei "Guangtai No.1", wherein (1) the water temperature is 28.3-28.7 DEG C when the Litopenaeus vannamei "Guangtai No.1" juvenile enters a breeding pond, and then is increased to 29.8-30.2 DEG C, and then is decreased to 28.8-29.2 DEG C when the M2 of Tachycaris sp. reaches, and is decreased to 27.8-28.2 DEG C when the P2 of the juvenile shrimp reaches; (2) the density is 180-200 thousand / m 3 ; (3) the feed: the metamorphosis of the nauplius into the copepodid is started, and the feed of Chateoceros muelleri and Skeletonema costatum is started, and the total density is kept as 400-600 pieces / ml; the microcapsule feed is supplemented when the copepodid is at the second stage, and the feeding frequency is 5-6 times per day; the Skeletonema costatum is fed when the copepodid is at the third stage, and the density is 90-110 pieces / ml; the microcapsule feed, shrimp slices and rotifer are fed when the Tachycaris sp. is at the first and second stages; the nauplius of Artemia is fed twice and the micro-particle feed is fed four times when the Tachycaris sp. is at the third stage; the nauplius of Artemia is fed four times and the micro-particle feed is fed twice when the juvenile shrimp is at the first stage. The application effectively improves the disease resistance of the shrimp fry, and improves the survival rate and the qualified rate.

The invention discloses a primer for detecting a Yangtze River acipenser body weight character related SNP molecular marker. The primer is characterized by comprising an upstream primer and a downstream primer, the nucleotide sequence of the upstream primer is as shown in SEQ ID NO: 1, and the nucleotide sequence of the downstream primer is as shown in SEQ ID NO: 2. The method can be used for breeding Yangtze River sturgeon juveniles with body weight character advantages and selecting parents. The invention firstly provides an SNP site related to the body weight character of acipenser Yangtze River. The SNP site exists in a low-weight population in sexual mature acipenser dungryanus individuals, and the technology can provide technical support for protection of acipenser dungryanus.